A rubber with high adhesiveness and its preparation method

Abstract

The present invention discloses a rubber with high adhesiveness and a preparation method thereof, relating to the field of rubber, and comprising the following raw materials in parts by weight: 40-60 parts of nitrile rubber; 20-40 parts of modified hydroxyl-terminated polydimethylsiloxane; 10-20 parts of nano-titanium dioxide; 1-3 parts of antioxidant; 2-8 parts of tackifier; 5-15 parts of silane coupling agent; 1-3 parts of sulfur; the modified hydroxyl-terminated polydimethylsiloxane is prepared by modifying the following raw materials: hydroxyl-terminated polydimethylsiloxane, N,N-dimethylformamide, water, potassium carbonate, 4-nitrophthalonitrile, toluene, hydrochloric acid solution. This application has the effect of improving the bonding performance between nitrile rubber and stainless steel.

Description

Technical Field

[0001] The present invention relates to the field of rubber, and particularly to a rubber with high adhesiveness and a preparation method thereof. Background Art

[0002] As an important elastic material, rubber is widely used in many fields such as automobiles, construction, aerospace, etc. Nitrile rubber, as a widely used synthetic rubber, is widely used in various sealing and shock-absorbing products due to its excellent oil resistance, wear resistance and heat resistance.

[0003] In the process of using traditional nitrile rubber materials to manufacture shock absorbers, if they need to be bonded to stainless steel materials, however, the bonding performance between nitrile rubber and stainless steel is poor, which easily affects the quality of products. Summary of the Invention

[0004] In order to improve the bonding performance between nitrile rubber and stainless steel, the present application provides a rubber with high adhesiveness and a preparation method thereof.

[0005] In a first aspect, the present application provides a rubber with high adhesiveness by adopting the following technical solution:

[0006] A rubber with high adhesiveness, comprising the following raw materials in parts by weight: 40-60 parts of nitrile rubber; 20-40 parts of modified hydroxyl-terminated polydimethylsiloxane; 10-20 parts of nano-titanium dioxide; 1-3 parts of antioxidant; 2-8 parts of tackifier; 5-15 parts of silane coupling agent; 1-3 parts of sulfur; the modified hydroxyl-terminated polydimethylsiloxane is prepared by modifying the following raw materials: hydroxyl-terminated polydimethylsiloxane, N, N-dimethylformamide, water, potassium carbonate, 4-nitrophthalonitrile, toluene, hydrochloric acid solution.

[0007] By adopting the above technical solution, the present application uses nitrile rubber as a rubber matrix, adds modified hydroxyl-terminated polydimethylsiloxane and nano-titanium dioxide and mixes them, which can improve the adhesion performance of the rubber. Adding antioxidant can effectively slow down the aging and decomposition process of the memory rubber and extend the service life of the memory rubber. The tackifier can improve the viscosity of the memory rubber. Adding stearic acid and sulfur, which react chemically with the rubber, enables the memory rubber to have good bonding performance.

[0008] Preferably, the preparation method of the modified hydroxyl-terminated polydimethylsiloxane is as follows: Mix 10-30 parts by weight of hydroxyl-terminated polydimethylsiloxane, 10-20 parts by weight of N,N-dimethylformamide, and 20-60 parts by weight of water under a nitrogen atmosphere, add 20-30 parts by weight of potassium carbonate and heat for reaction. After cooling, add 20-40 parts by weight of 4-nitrophthalonitrile and continue heating and mixing. Add 10-20 parts by weight of toluene and stir, then add 10-20 parts by weight of 5% hydrochloric acid solution and continue stirring. After filtration and washing, dry to obtain the modified hydroxyl-terminated polydimethylsiloxane.

[0009] By adopting the above technical solution, in this application, the hydroxyl group in the hydroxyl-terminated polydimethylsiloxane reacts with 4-nitrophthalonitrile through the modification of the hydroxyl-terminated polydimethylsiloxane, grafting 4-nitrophthalonitrile onto the hydroxyl-terminated polydimethylsiloxane to generate a phthalonitrile-terminated polysiloxane chain segment with a cyano group, thereby increasing the viscosity of the hydroxyl-terminated polydimethylsiloxane, and further increasing the viscosity of the rubber.

[0010] Preferably, the weight ratio of the hydroxyl-terminated polydimethylsiloxane, N,N-dimethylformamide, and 4-nitrophthalonitrile is 1:(0.6-0.7):(1.6-1.8).

[0011] By adopting the above technical solution, when the hydroxyl-terminated polydimethylsiloxane, N,N-dimethylformamide, and 4-nitrophthalonitrile are in a specific weight ratio, the three cooperate together, and the reaction between the hydroxyl group in the hydroxyl-terminated polydimethylsiloxane and 4-nitrophthalonitrile effectively improves the compatibility of the hydroxyl-terminated polydimethylsiloxane with other components, and further improves the adhesion and weather resistance of the rubber.

[0012] Preferably, the nano-titanium dioxide is modified nano-titanium dioxide, and the preparation method of the modified nano-titanium dioxide is as follows: Heat and stir 10-15 parts by weight of ammonia water, 30-40 parts by weight of ethanol, 20-30 parts by weight of deionized water, 15-25 parts by weight of tetraethyl orthosilicate, and 20-30 parts by weight of cetyltrioxysilane, then add 10-20 parts by weight of nano-titanium dioxide and mix and stir to obtain the modified nano-titanium dioxide.

[0013] By adopting the above technical solution, ammonia water and ethanol promote the hydrolysis and condensation of tetraethyl orthosilicate to form silanol groups, which helps to form a uniformly dispersed system of nano-titanium dioxide in the rubber system; at the same time, the long-chain alkyl part of cetyltrioxysilane can increase the bonding performance of the rubber, and the silanol groups can also form chemical bonds with the rubber components, while modifying the surface of the nano-titanium dioxide to increase the compatibility of the nano-titanium dioxide with the rubber, thereby further improving the bonding performance and weather resistance of the rubber.

[0014] Preferably, the weight ratio of the nano-titanium dioxide, tetraethyl orthosilicate and hexadecyltrioxysilane is (0.5 - 0.6):1:(1.2 - 1.4).

[0015] By adopting the above technical solution, when the nano-titanium dioxide, tetraethyl orthosilicate and hexadecyltrioxysilane are in a specific weight ratio, the three cooperate together. Tetraethyl orthosilicate and hexadecyltrioxysilane can be used as coupling agents to form chemical bonds on the surface of the nano-titanium dioxide, improving the dispersibility of the nano-titanium dioxide as a filler in the rubber. At the same time, the silane groups in tetraethyl orthosilicate and hexadecyltrioxysilane combine with the nano-titanium dioxide, which can improve the lubricity of the rubber and enhance the bonding performance and weather resistance of the rubber.

[0016] Preferably, the weight ratio of the nitrile rubber, modified hydroxyl-terminated polydimethylsiloxane and modified nano-titanium dioxide is 1:(0.64 - 0.72):(0.32 - 0.36).

[0017] By adopting the above technical solution, when the nitrile rubber, modified hydroxyl-terminated polydimethylsiloxane and modified nano-titanium dioxide are in a specific weight ratio, the modified hydroxyl-terminated polydimethylsiloxane forms hydrogen bonds with the polar groups of the nitrile rubber through its hydroxyl groups, improving the compatibility and adhesiveness between the two. The modified titanium dioxide can improve the mechanical strength of the rubber, thereby enhancing the bonding performance and mechanical strength of the rubber.

[0018] Preferably, the tackifier is selected from one of polyethylene, rosin glyceride and terpene resin.

[0019] By adopting the above technical solution, selecting a suitable tackifier can enable the nitrile rubber and the hydroxyl-terminated polydimethylsiloxane to wet and bond the surface through surface diffusion, improving the adhesiveness of the rubber.

[0020] Preferably, the antioxidant is selected from one of antioxidant 168 and antioxidant 1010.

[0021] By adopting the above technical solution, selecting a suitable antioxidant can inhibit the aging and decomposition of the rubber during processing or use.

[0022] In the second aspect, a preparation method of a rubber with high adhesiveness provided by the present application adopts the following technical solution:

[0023] A preparation method of a rubber with high adhesiveness includes the following steps:

[0024] S1. Mix the nitrile rubber, modified hydroxyl-terminated polydimethylsiloxane and nano-titanium dioxide in proportion and stir to obtain a mixture.

[0025] S2. Put antioxidants, silane coupling agents, and tackifiers into the mixture and stir evenly, then extrude and mold to obtain an extrudate;

[0026] S3. Vulcanize the extrudate with sulfur and then cool it to obtain a rubber with high adhesiveness.

[0027] By adopting the above technical solution, after using nitrile rubber and mixing it with modified hydroxyl-terminated polydimethylsiloxane and nano-titanium dioxide, and then successively adding antioxidants, silane coupling agents, and tackifiers, it can be better dispersed into the mixture. Then, vulcanize the extrudate with sulfur to make the rubber have good bonding properties and tensile strength.

[0028] In summary, the present application has the following beneficial effects:

[0029] 1. The present application uses nitrile rubber as the rubber matrix, adds modified hydroxyl-terminated polydimethylsiloxane and nano-titanium dioxide for mixing, which can improve the adhesion performance of the rubber. Adding antioxidants can effectively slow down the aging and decomposition process of the shape memory rubber and extend the service life of the shape memory rubber. The tackifier can improve the viscosity of the shape memory rubber. Adding stearic acid and sulfur to react with the rubber makes the shape memory rubber have good bonding properties.

[0030] 2. By modifying hydroxyl-terminated polydimethylsiloxane in the present application, the hydroxyl group in hydroxyl-terminated polydimethylsiloxane reacts with 4-nitrophthalonitrile, grafts 4-nitrophthalonitrile onto hydroxyl-terminated polydimethylsiloxane, and generates a phthalonitrile-containing cyano-terminated polysiloxane chain segment, thereby increasing the viscosity of hydroxyl-terminated polydimethylsiloxane, and further increasing the viscosity of the rubber. Detailed implementation mode

[0031] The present application will be further described in detail below with reference to examples and comparative examples.

[0032] Example

[0033] Example 1

[0034] A preparation method of a rubber with high adhesiveness, comprising the following steps:

[0035] S1. Put 40 g of nitrile rubber, 20 g of modified hydroxyl-terminated polydimethylsiloxane, and 10 g of nano-titanium dioxide into a blender, and mix evenly for 30 min at a temperature of 60 °C and a rotation speed of 60 r / min to obtain a mixture;

[0036] S2. Put 1 g of antioxidant, 5 g of silane coupling agent, and 2 g of tackifier into the mixture and stir evenly for 30 min at a rotation speed of 80 r / min, and then extrude and mold through an extruder to obtain an extrudate;

[0037] S3. 1 g of sulfur and the extrudate are put into a rubber injection molding machine for vulcanization and cooled for 2 h to obtain a rubber with high adhesiveness. The nitrile rubber is Zeon PBZ123 from Japan, the antioxidant is antioxidant 168, the silane coupling agent is KH560, and the tackifier is polyethylene purchased from Hebei Baini Technology Co., Ltd. with the product number LLDPE - 7042.

[0038] The preparation method of the modified hydroxy - terminated polydimethylsiloxane is as follows: 10 g of hydroxy - terminated polydimethylsiloxane, 10 g of N, N - dimethylformamide and 20 g of water are mixed and stirred for 10 min under a nitrogen atmosphere, 20 g of potassium carbonate is added and heated to 85 °C for reaction for 4 h. After cooling to 35 °C, 20 g of 4 - nitrophthalonitrile is added and the temperature is further raised to 90 °C for mixing for 6 h. 10 g of toluene is added and stirred, then 10 g of 5% hydrochloric acid solution is added and stirred for another 15 min. After filtration, it is washed with deionized water and dried in a forced - air oven to obtain the modified hydroxy - terminated polydimethylsiloxane. The hydroxy - terminated polydimethylsiloxane is purchased from kemike with the product number l389023.

[0039] Example 2

[0040] A preparation method of a rubber with high adhesiveness, comprising the following steps:

[0041] S1. 60 g of nitrile rubber, 40 g of modified hydroxy - terminated polydimethylsiloxane and 20 g of nano - titanium dioxide are put into a blender and mixed evenly for 30 min under the conditions of a temperature of 60 °C and a rotation speed of 60 r / min to obtain a mixture.

[0042] S2. 3 g of antioxidant, 15 g of silane coupling agent and 8 g of tackifier are put into the mixture and stirred evenly for 30 min under the condition of a rotation speed of 80 r / min, and then extruded and formed through an extruder to obtain an extrudate.

[0043] S3. 3 g of sulfur and the extrudate are put into a rubber injection molding machine for vulcanization and cooled for 2 h to obtain a rubber with high adhesiveness. The nitrile rubber is Zeon PBZ123 from Japan, the antioxidant is antioxidant 1010, the silane coupling agent is KH560, and the tackifier is terpene resin purchased from Jinan Yuxin Chemical Co., Ltd. with the product number JL100.

[0044] The preparation method of the modified hydroxyl-terminated polydimethylsiloxane is as follows: 10 g of hydroxyl-terminated polydimethylsiloxane, 10 g of N,N-dimethylformamide and 20 g of water are mixed and stirred for 10 min under a nitrogen atmosphere, 20 g of potassium carbonate is added and heated to 85 °C for reaction for 4 h. After cooling to 35 °C, 20 g of 4-nitrophthalonitrile is added and the temperature is raised to 90 °C for mixing for 6 h. 10 g of toluene is added and stirred, then 10 g of 5% hydrochloric acid solution is added and stirred for another 15 min. After filtration, it is washed with deionized water and dried in a forced-air oven to obtain the modified hydroxyl-terminated polydimethylsiloxane. The hydroxyl-terminated polydimethylsiloxane is purchased from kemike, and the product number is l389023.

[0045] Example 3

[0046] A preparation method of a rubber with high adhesiveness includes the following steps:

[0047] S1. Put 50 g of nitrile rubber, 30 g of modified hydroxyl-terminated polydimethylsiloxane and 15 g of nano-titanium dioxide into a mixer, and mix evenly for 30 min under the conditions of a temperature of 60 °C and a rotation speed of 60 r / min to obtain a mixed material;

[0048] S2. Put 2 g of antioxidant, 10 g of silane coupling agent and 5 g of tackifier into the mixed material and stir evenly for 30 min under the condition of a rotation speed of 80 r / min, and extrude and form through an extruder to obtain an extrudate;

[0049] S3. Use 2 g of sulfur and the extrudate and put them into a rubber injection molding machine for vulcanization, and cool for 2 h to obtain a rubber with high adhesiveness. The nitrile rubber is selected as Nippon Zeon PBZ123, the antioxidant is antioxidant 1010, the silane coupling agent is KH560, the tackifier is rosin glyceride, and it is purchased from Hebei Wanshan New Material Technology Co., Ltd.

[0050] The preparation method of the modified hydroxyl-terminated polydimethylsiloxane is as follows: 10 g of hydroxyl-terminated polydimethylsiloxane, 10 g of N,N-dimethylformamide and 20 g of water are mixed and stirred for 10 min under a nitrogen atmosphere, 20 g of potassium carbonate is added and heated to 85 °C for reaction for 4 h. After cooling to 35 °C, 20 g of 4-nitrophthalonitrile is added and the temperature is raised to 90 °C for mixing for 6 h. 10 g of toluene is added and stirred, then 10 g of 5% hydrochloric acid solution is added and stirred for another 15 min. After filtration, it is washed with deionized water and dried in a forced-air oven to obtain the modified hydroxyl-terminated polydimethylsiloxane. The hydroxyl-terminated polydimethylsiloxane is purchased from kemike, and the product number is l389023.

[0051] Example 4

[0052] A preparation method of a rubber with high adhesiveness, which is different from Example 3 in that: the preparation method of the modified hydroxyl-terminated polydimethylsiloxane is as follows: 30 g of hydroxyl-terminated polydimethylsiloxane, 20 g of N,N-dimethylformamide and 60 g of water are mixed and stirred for 10 min under a nitrogen atmosphere, 30 g of potassium carbonate is added and heated to 85 °C for reaction for 4 h, after cooling to 35 °C, 40 g of 4-nitrophthalonitrile is added and the temperature is further raised to 90 °C for mixing for 6 h, 20 g of toluene is added and stirred, then 20 g of 5% hydrochloric acid solution is added and stirred for another 15 min, filtered and washed with deionized water, and dried in a forced-air oven to obtain the modified hydroxyl-terminated polydimethylsiloxane.

[0053] Example 5

[0054] A preparation method of a rubber with high adhesiveness, which is different from Example 3 in that: in the process of preparing the modified hydroxyl-terminated polydimethylsiloxane, the input amount of hydroxyl-terminated polydimethylsiloxane is 20 g, the input amount of N,N-dimethylformamide is 12 g, and the input amount of 4-nitrophthalonitrile is 32 g.

[0055] Example 6

[0056] A preparation method of a rubber with high adhesiveness, which is different from Example 3 in that: in the process of preparing the modified hydroxyl-terminated polydimethylsiloxane, the input amount of hydroxyl-terminated polydimethylsiloxane is 20 g, the input amount of N,N-dimethylformamide is 14 g, and the input amount of 4-nitrophthalonitrile is 36 g.

[0057] Example 7

[0058] A preparation method of a rubber with high adhesiveness, which is different from Example 6 in that: the nano-titanium dioxide is replaced with an equal amount of modified nano-titanium dioxide, and the preparation method of the modified nano-titanium dioxide is as follows: 10 g of ammonia water, 30 g of ethanol, 20 g of deionized water, 15 g of tetraethyl orthosilicate and 20 g of cetyltrioxysilane are heated in a magnetic stirrer at a temperature of 60 °C and stirred for 10 min at a rotation speed of 1000 r / min, then 10 g of nano-titanium dioxide is added and mixed and stirred for 3 h at a rotation speed of 500 r / min to obtain the modified nano-titanium dioxide.

[0059] Example 8

[0060] A preparation method of a rubber with high adhesiveness, which is different from Example 6 in that: the nano-titanium dioxide is replaced with modified nano-titanium dioxide in equal amount, and the preparation method of the modified nano-titanium dioxide is as follows: 15 g of ammonia water, 40 g of ethanol, 30 g of deionized water, 25 g of tetraethyl orthosilicate and 30 g of cetyltrioxysilane are heated in a magnetic stirrer at a temperature of 60 °C and stirred for 10 min at a rotation speed of 1000 r / min, then 20 g of nano-titanium dioxide is added and mixed and stirred for 3 h at a rotation speed of 500 r / min to obtain the modified nano-titanium dioxide.

[0061] Example 9

[0062] A preparation method of a rubber with high adhesiveness, which is different from Example 8 in that: during the preparation of the modified nano-titanium dioxide, the input amount of nano-titanium dioxide is 10 g, the input amount of tetraethyl orthosilicate is 20 g, and the input amount of cetyltrioxysilane is 24 g.

[0063] Example 10

[0064] A preparation method of a rubber with high adhesiveness, which is different from Example 8 in that: during the preparation of the modified nano-titanium dioxide, the input amount of nano-titanium dioxide is 12 g, the input amount of tetraethyl orthosilicate is 20 g, and the input amount of cetyltrioxysilane is 28 g.

[0065] Example 11

[0066] A preparation method of a rubber with high adhesiveness, which is different from Example 10 in that: the input amount of nitrile rubber is 50 g, the input amount of modified hydroxyl-terminated polydimethylsiloxane is 32 g, and the input amount of modified nano-titanium dioxide is 16 g.

[0067] Example 12

[0068] A preparation method of a rubber with high adhesiveness, which is different from Example 10 in that: the input amount of nitrile rubber is 50 g, the input amount of modified hydroxyl-terminated polydimethylsiloxane is 36 g, and the input amount of modified nano-titanium dioxide is 18 g.

[0069] Comparative example

[0070] Comparative example 1

[0071] A preparation method of a rubber with high adhesiveness, which is different from Example 3 in that: the modified hydroxyl-terminated polydimethylsiloxane is replaced with hydroxyl-terminated polydimethylsiloxane in equal amount.

[0072] Comparative example 2

[0073] A preparation method of a rubber with high adhesiveness, which is different from Example 3 in that: the modified hydroxyl-terminated polydimethylsiloxane is replaced with polycarbonate in equal amount, and the polycarbonate is purchased from Covestro Bayer, with the grade of 1895.

[0074] Comparative Example 3

[0075] A preparation method of a rubber with high adhesiveness, which is different from Example 3 in that: the nano-titanium dioxide is replaced with silicon dioxide in equal amount.

[0076] Comparative Example 4

[0077] A preparation method of a rubber with high adhesiveness, which is different from Example 3 in that: the modified hydroxyl-terminated polydimethylsiloxane is replaced with polydimethylsiloxane in equal amount, and the polydimethylsiloxane is purchased from Lanabai, with the grade of PEG-1.

[0078] Performance detection test:

[0079] Adhesiveness test: The rubbers prepared in Examples 1-12 and Comparative Examples 1-4 are bonded to a stainless steel plate with a length of 60 mm, a width of 25 mm, and a thickness of 1.5 mm; the thickness of the rubber is 6 mm; according to GB / T7760-2003 "Determination of Adhesion Strength between Vulcanized Rubber or Thermoplastic Rubber and Rigid Plates", the adhesion strength (N / mm) between the rubber and the plate is tested.

[0080] Tensile strength: The rubbers prepared in Examples 1-12 and Comparative Examples 1-4 are tested with reference to "GBT 528-1998 Determination of Tensile Stress-Strain Properties of Vulcanized Rubber or Thermoplastic Rubber".

[0081] Weather resistance: The rubbers prepared in Examples 1-12 and Comparative Examples 1-4 are bonded to a stainless steel plate and placed in an aging oven at a temperature of 300 °C for 7 days, and then the tensile strength of the rubber is tested.

[0082] Adhesion strength (N / mm) Tensile strength MPa Tensile strength MPa after 7d Example 1 13.8 32.5 30.7 Example 2 13.7 32.2 30.4 Example 3 13.9 32.5 30.8 Example 4 13.9 32.4 30.7 Example 5 14.3 32.6 31.3 Example 6 14.5 32.5 31.4 Example 7 16.2 33.1 31.8 Example 8 16.1 33.0 31.9 Example 9 17.7 33.2 32.4 Example 10 17.8 33.3 32.5 Example 11 18.5 33.6 33.2 Example 12 18.6 33.8 33.4 Comparative Example 1 12.8 28.4 20.1 Comparative Example 2 11.4 27.7 18.4 Comparative Example 3 12.2 29.6 20.8 Comparative Example 3 11.1 25.9 14.3

[0083] According to the data comparison of Examples 1-4 and Comparative Examples 1-4, in this application, nitrile rubber is used as the rubber matrix, and the addition of modified hydroxyl-terminated polydimethylsiloxane and nano-titanium dioxide can improve the adhesion performance of the rubber. The addition of antioxidants can effectively slow down the aging and decomposition process of the memory rubber and extend the service life of the memory rubber. The tackifier can improve the tackiness of the memory rubber. The addition of stearic acid and sulfur can react chemically with the rubber to make the memory rubber have good bonding performance.

[0084] According to the data comparison of Examples 3-6, when the terminal hydroxyl polydimethylsiloxane, N,N-dimethylformamide and 4-nitrophthalonitrile are in a specific weight ratio, the three cooperate together, and the reaction of the hydroxyl groups in the hydroxyl-terminated polydimethylsiloxane with 4-nitrophthalonitrile can effectively improve the compatibility of the hydroxyl-terminated polydimethylsiloxane with other components, thereby improving the adhesion and weather resistance of the rubber.

[0085] According to the data comparison of Examples 6-8, ammonia water and ethanol promote the hydrolysis and condensation of tetraethyl orthosilicate to form silanol groups, which helps to form a uniformly dispersed system of nano-titanium dioxide in the rubber system; at the same time, the long-chain alkyl part of cetyltrioxysilane can increase the bonding performance of the rubber, and the silanol groups can also form chemical bonds with the rubber components, while modifying the surface of nano-titanium dioxide and increasing the compatibility of nano-titanium dioxide with the rubber, thereby further improving the bonding performance and weather resistance of the rubber.

[0086] According to the data comparison of Examples 8-10, when nano-titanium dioxide, tetraethyl orthosilicate and cetyltrioxysilane are in a specific weight ratio, the three cooperate together, and tetraethyl orthosilicate and cetyltrioxysilane can be used as coupling agents to form chemical bonds on the surface of nano-titanium dioxide, improving the dispersibility of nano-titanium dioxide as a filler in the rubber. At the same time, the silane groups in tetraethyl orthosilicate and cetyltrioxysilane combine with nano-titanium dioxide, which can improve the lubricity of the rubber and improve the bonding performance and weather resistance of the rubber.

[0087] According to the data comparison of Examples 10-12, when nitrile rubber, modified terminal hydroxyl polydimethylsiloxane and modified nano-titanium dioxide are in a specific weight ratio, the modified terminal hydroxyl polydimethylsiloxane forms hydrogen bonds with the polar groups of nitrile rubber through its hydroxyl groups, improving the compatibility and adhesion between the two. The modified titanium dioxide can improve the mechanical strength of the rubber, thereby improving the bonding performance and mechanical strength of the rubber.

[0088] The embodiments of the present application are only explanations of the present application, and they do not limit the present application. Those skilled in the art can make modifications without creative contributions to this embodiment after reading this specification, but as long as they are within the scope of the claims of the present application, they are protected by the patent law.

Claims

1. A rubber with high adhesiveness, characterized in that: The invention comprises the following raw materials in parts by weight: 40-60 parts of nitrile rubber; 20-40 parts of modified terminal hydroxyl polydimethylsiloxane; 10-20 parts of nano titanium dioxide; 1-3 parts of antioxidant; 2-8 parts of tackifier; 5-15 parts of silane coupling agent; and 1-3 parts of sulfur. The modified hydroxy-terminated polydimethylsiloxane is prepared by modifying the following raw materials: hydroxy-terminated polydimethylsiloxane, N,N-dimethylamide, water, potassium carbonate, 4-nitrophthalonitrile, toluene, and hydrochloric acid solution; and the preparation method of the modified hydroxy-terminated polydimethylsiloxane is as follows: 10-30 parts by weight of hydroxyl-terminated polydimethylsiloxane, 10-20 parts by weight of N,N-dimethylamide and 20-60 parts by weight of water are mixed under a nitrogen environment, 20-30 parts by weight of potassium carbonate are added for heating reaction, 20-40 parts by weight of 4-nitrophthalonitrile are added after cooling, and the mixture is heated and mixed continuously, 10-20 parts by weight of toluene are added and stirred, and then 10-20 parts by weight of 5% hydrochloric acid solution are added and stirred continuously, the mixture is filtered, washed and dried to obtain the modified hydroxyl-terminated polydimethylsiloxane; Wherein, the nano titanium dioxide is modified nano titanium dioxide, and the preparation method of the modified nano titanium dioxide is: 10-15 parts by weight of ammonia water, 30-40 parts by weight of ethanol, 20-30 parts by weight of deionized water, 15-25 parts by weight of ethyl orthosilicate and 20-30 parts by weight of hexadecyltrioxysilane are heated and stirred, and then 10-20 parts by weight of nano titanium dioxide are added and mixed to obtain modified nano titanium dioxide.

2. The rubber with high adhesiveness according to claim 1, characterized in that: The weight ratio of the terminal hydroxyl polydimethylsiloxane, N,N-dimethylamide and 4-nitrophthalonitrile is 1: (0.6-0.7): (1.6-1.8).

3. The rubber with high adhesiveness according to claim 1, characterized in that: The weight ratio of the nano titanium dioxide, ethyl orthosilicate and hexadecyltrioxysilane is (0.5-0.6):1:(1.2-1.4).

4. The rubber with high adhesiveness according to claim 1, characterized in that: The weight ratio of the nitrile rubber, the modified terminal hydroxyl polydimethylsiloxane and the modified nano titanium dioxide is 1: (0.64-0.72): (0.32-0.36).

5. The rubber with high adhesiveness according to claim 1, characterized in that: The tackifier is selected from one of polyethylene, rosin glycerol ester and terpene resin.

6. The rubber with high adhesiveness according to claim 1, characterized in that: The antioxidant is selected from one of antioxidant 168 and antioxidant 1010.

7. A method for preparing a rubber with high adhesiveness, characterized in that: The method for preparing the rubber with high adhesion according to any one of claims 1 to 6 comprises the following steps: S1. The nitrile rubber, modified hydroxy-terminated polydimethylsiloxane and nano-titanium dioxide are uniformly mixed and stirred in proportion to obtain a mixture; S2. The antioxidant, silane coupling agent and tackifier are added to the mixture and stirred evenly, and extruded to obtain an extrudate; S3. vulcanizing the extrudate with sulfur, cooling it, and obtaining a rubber with high adhesion.